<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        console.log(18);
        console.log('18');
        console.log(true);
        console.log(undefined);
        console.log(null);
    </script>
</head>
<body>

</body>
</html>